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A Critical Review on Soil Chemical Processes that Control How Soil pH Affects Phosphorus Availability to Plants

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  • Chad J. Penn

    (USDA-ARS National Soil Erosion Research Laboratory, West Lafayette, IN 47907, USA)

  • James J. Camberato

    (Purdue University, Department of Agronomy, West Lafayette, IN 47907, USA)

Abstract

Occasionally, the classic understanding of the effect of pH on P uptake from soils is questioned through the claim that maximum P uptake occurs at a pH much lower than 6.5–7. The purpose of this paper was to thoroughly examine that claim and provide a critical review on soil processes that control how soil pH affects P solubility and availability. We discuss how individual P retention mechanisms are affected by pH in isolation and when combined in soils, and how both real and apparent exceptions to the classic view can occasionally occur due to dynamics between mechanisms, experimental techniques (equilibration time, method of soluble P extraction, and pH adjustment), and plant species that thrive under acidic conditions. While real exceptions to the rule of thumb of maximum P availability at near neutral pH can occur, we conclude that the classic textbook recommendation is generally sound.

Suggested Citation

  • Chad J. Penn & James J. Camberato, 2019. "A Critical Review on Soil Chemical Processes that Control How Soil pH Affects Phosphorus Availability to Plants," Agriculture, MDPI, vol. 9(6), pages 1-18, June.
    • Handle: RePEc:gam:jagris:v:9:y:2019:i:6:p:120-:d:238236
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    References listed on IDEAS

    as
    1. Chad J. Penn & E. Bryan Rutter & D. Brian Arnall & James Camberato & Mark Williams & Patrick Watkins, 2018. "A Discussion on Mehlich-3 Phosphorus Extraction from the Perspective of Governing Chemical Reactions and Phases: Impact of Soil pH," Agriculture, MDPI, vol. 8(7), pages 1-20, July.
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